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<p>Crop coefficient (Kc) is a critical parameter for estimating the actual evapotranspiration of vegetation. To fill the gap in vegetation Kc in the Sanjiangyuan Region and improve their accuracy, this study determined monthly Kc for various typical vegetation types using lysimeter-measured data combined with the FAO-56 single crop coefficient method. A machine learning model was employed to simulate actual evapotranspiration for different vegetation types. Based on a long-term series of actual and potential evapotranspiration, monthly crop coefficient ranges were established for multiple vegetation types. The results indicate that similar vegetation types on the same underlying surface can share a standard crop coefficient for evapotranspiration estimation. In contrast, the same vegetation type on different surfaces exhibits slight variations in Kc. Kc should be considered as reference intervals rather than fixed values, as monthly Kc values vary across different vegetation types. The mean values of the measured Kc of alpine grasslands (including alpine desert steppe, alpine steppe, and alpine meadow) during the growing season (from May to October) were 0.55, 0.75, 1.03, 1.11, 0.98, and 0.64, respectively. For alpine shrubs, the mean values of their measured Kc in the growing season were 0.76, 0.90, 1.11, 1.00, 1.74, and 1.13, respectively.</p>

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Study on crop coefficient of vegetation in cold and high-altitude regions based on lysimeter measurements

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Liuyan Qu,
  • Runjie Li,
  • Shaofeng Jia,
  • Zhanyi Gao,
  • Haorui Chen

摘要

Crop coefficient (Kc) is a critical parameter for estimating the actual evapotranspiration of vegetation. To fill the gap in vegetation Kc in the Sanjiangyuan Region and improve their accuracy, this study determined monthly Kc for various typical vegetation types using lysimeter-measured data combined with the FAO-56 single crop coefficient method. A machine learning model was employed to simulate actual evapotranspiration for different vegetation types. Based on a long-term series of actual and potential evapotranspiration, monthly crop coefficient ranges were established for multiple vegetation types. The results indicate that similar vegetation types on the same underlying surface can share a standard crop coefficient for evapotranspiration estimation. In contrast, the same vegetation type on different surfaces exhibits slight variations in Kc. Kc should be considered as reference intervals rather than fixed values, as monthly Kc values vary across different vegetation types. The mean values of the measured Kc of alpine grasslands (including alpine desert steppe, alpine steppe, and alpine meadow) during the growing season (from May to October) were 0.55, 0.75, 1.03, 1.11, 0.98, and 0.64, respectively. For alpine shrubs, the mean values of their measured Kc in the growing season were 0.76, 0.90, 1.11, 1.00, 1.74, and 1.13, respectively.